Disappeared military units

I had a number of military units that have been deleted. I had several long range divisions, attack and bombing units, missile defense units that are no longer in my army? Any idea what happened? I didn't disband any units, and truthfully, I haven't been paying attention to the military for some time. Is it possible in an update or other they got deleted? Has anyone else had this issue?

TM

Sorry, Country Bella Donna on WG.

Did you have the proper maintenance?

If they ran out of ammo the units were disbanded and weapons sold to buy ammo.